It would be intersting to see whether changing the O2 output from the sensor would work. exactly how does the sensor control the ECU, is it just a voltage output and if so you could perhaps lower it but can not increse it with resistors. I have tried adjusting the resistance of the input air which made the mixture richer and helped with the idle speed but think the effect goes away when the 2 sensor takes over. Do you have any idea what the resistance vale would be to add to the signal output.
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